【摘要】 长偏移距瞬变电磁测深法（LOWTEM）作为电法勘探中的一门新兴技术，其研究与应用在我国尚属探索阶段，其测量数据的处理与解释也仅局限于定性范畴。为了使该方法获得的大量时间域数据能够得到快速准确的处理和定量解释，本文提出了一种实用的资料处理与解释方法，内容包括：①利用密集采样的感应电动势曲线积分求取随时间变化的垂直磁场值；②以垂直磁场定义全区视电阻率，然后采用数值迭代法求取电阻率曲线；③对计算结果进行时频转换；④引入MT反演方法对时频转换视电阻车曲线进行反演。通过模型试算，证明该方法能够较好地解决多解性问题，实现了全区解释，提高了解释精度，具备了现场解释的能力。更多还原

【Abstract】 Long-offset transient electromagnetic sounding is a new technique in electric survey. Its research and application in China are only in initial phase, and its data processing and interpretation are only qualitative. In order to achieve efficient pro-cessing and quantitative interpretation of volumed transient electromagnetic data in time domain, we develop a practical method for data processing and interpretation,which includes four steps:. Time-dependent vertical component of magnetic field is obtained by integrating an induced electromotance curve derived from dense sampling.. All-time apparent resistivity is defined by using the vertical component of magnetic field, and then the apparent resistivity curve is calculated by taking numerical iterative method.. The resultant all-time resistivity is transformed from time domain to frequency domain.·The inversion of transformed apparent resistivities is achieved finally by introducing MT inversion method.Modeling computation testifies that the technique desirably avoids multi-solution, achieves reasonable all-time interpretation, and offers improved accuracy and field interpretation ability.更多还原